Lattice parameter engineering for III–V long wave infrared photonics

The design and fabrication of metamorphic periodic heterostructures containing InAsSb layers with controllable modulated Sb composition and well-regulated band alignments are reported. The bandgap energy of ordered alloy can be much smaller than that in bulk InAsSb with any Sb content. The modulation period is determined by the thicknesses of the strain compensated InAsSb_x/InAsSb_y pairs grown on a virtual GaIn_zSb substrate with a given lattice constant. The experiment shows that the deviation of the modulation period from ~2.3 to ~5.5 nm leads to the shift of the maximum of 20 K photoluminescence from 12.9 to 19.6 μm. It is concluded that the growth of strain compensated InAsSb_x/InAsSb_y on virtual substrates allows developing narrow bandgap III-V materials with various bandgap energies.